RFK said that he defunded all research into idea that autism is genetically inherited and said that he believes that autism is caused by environmental factors.

The purpose of the 'tylenol causes autism' announcement was basically to defund all government research on Autism.

Also it's not just a RFK thing. Trump is a long time antivaxxer himself. This is weird because Trump celebrated his 'Operation Warp Speed' vaccine, even though his base made up conspiracy theories that Trump's vaccine would kill you. Trump said some things during the announcement the MMR vaccine being bad because it was 3 vaccines in 1 and that babies are being injected with too much liquid.

Something to consider about the right wing worldview is that they often believe in a thing called the 'Just World' fallacy. This way of thinking supposes that the world as it exists is perfectly fair: if good things happen to you then it is because you do the right stuff and if bad things happen to you it is because you did something to deserve it.

Right wingers are predisposed into believing that someone who have autism did something to deserve it.